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Adjustment procedure (Fig.15)
1 ) Lean the machine head backward.
2)
Turn the hand wheel by hand and stop when the feed dog rises to the maximum height.
3)
Loosen the feed bar setscrew.
4)
Vertically move the feed bar (in the direction indicated by arrow in the figure) to adjust it to adequate
height.
5)
After the adjustment, tighten the feed bar setscrew.
The feed dog height is factory-adjusted to 1.2mm
11. Relationship between rotating hook motion and take-up lever motion (Fig.16)
When the timing belt (toothed belt) was removed for its
replacement, for example, the relationship between rotating hook
motion and take-up lever motion should be adjusted as follows:
1)
Turn the balance wheel and stop when the take-up lever is
lifted to its upper dead point.
2 ) Lean the machine head backward and make sure the
arrow (timing mark) put on the timing belt is in line with the black
line on the boss oflower shaft bearing.
3)
If
the timing mark is not in line with the black line,
remove the timing belt and install it again to adjust
12. Relationship between needle motion and feed dog
motion (Fig.17.18.19)
Black line on boss of
lower shaft bearing
TI ming bell sprocket
1 6
Feed lifting rock
shall crank (middle)
Feed lifting rock
1 ) Set feed length to "O" on the feed setting dial
.~~---0
shaftcrank(right)
A
-h:_·
' - - .
..· '---
:---i\ .
.
-.
..
.:-·
.
.
--~-
--
·-...
\
'0?-JJ!=~-~J
2)
Lean the machine head backward.
3)
Loosen the feed lifling rock shaft crank set Screws A
andB
4)
Set the needle at the lowest position.
5)
Adjust the distance between presser rod and Vibration
prevention rod to 8mm and temporarily tighten the feed lifting
rock shaft crank set screws A and B
6)
Check that the right feed lifting rocks haft crank is connected
with the link at right angle, as shown in Figure.
7)
If
the connection is not at
right angle, remove the back cover,
loosen screw C and move the right
link to connect the right feed lifting
rockshaft with the link at right angle.
8) After
the
completion
of
adjustment, fully tighten the screws A.
B andC
At this time make certain that
needle can enter the feed dog needle
hole at the center of the hole.
8mm
I
J
I
o - - - - r r - = - -
- 5 -
Needle rod
Vibration
prevention
rod
18
B
-.
1:\-.10
\
I!
Link
,,
~
~
iJ
'
~·J
l
~-
---
.
'':~;~/,~-
F .. d llfllng rock
shafl crank (nghl)
17
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